Mr. Gerrey, I just knew, somehow, that you had done some research on 
ticks!  I am surprised that you settled on a square wave at 8 kilohertz.  
There are some folks that can hear 8 Khz pretty good, but nobody I know 
that can hear the second harmonic, let alone all the rich overtones of 
such a high frequency.  I would think that two cycles of 3 kilohertz 
square wave would be a more useful choice.  This should be specially true 
for guys my age.  Can I assume that you made your tests while you were 
still young?
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